6394081961 has 2 divisors, whose sum is σ = 6394081962. Its totient is φ = 6394081960.

The previous prime is 6394081957. The next prime is 6394082059. The reversal of 6394081961 is 1691804936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4055779225 + 2338302736 = 63685^2 + 48356^2 .

It is a cyclic number.

It is not a de Polignac number, because 6394081961 - 2² = 6394081957 is a prime.

It is not a weakly prime, because it can be changed into another prime (6394081901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3197040980 + 3197040981.

It is an arithmetic number, because the mean of its divisors is an integer number (3197040981).

Almost surely, 2^6394081961 is an apocalyptic number.

It is an amenable number.

6394081961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6394081961 is an equidigital number, since it uses as much as digits as its factorization.

6394081961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 6394081961 is about 79963.0037017120. The cubic root of 6394081961 is about 1856.0630839675.

The spelling of 6394081961 in words is "six billion, three hundred ninety-four million, eighty-one thousand, nine hundred sixty-one".